shudry_toster

from django.urls import reverse
from django.shortcuts import redirect

class AlreadyLoggedIn(object):
    def dispatch(self, request, *args, **kwargs):
        if request.user.is_authenticated:
            return redirect(reverse('your-url'))
        else:
            return super(AlreadyLoggedIn, self).dispatch(request, *args, **kwargs)

class LoginFormView(AlreadyLoggedIn, FormView):
...